[Tilecache] Building static tilecache with ESRI software
mattxbart at gmail.com
Wed Feb 25 13:12:33 EST 2009
On Wed, Feb 25, 2009 at 9:40 AM, Eric Wolf <ebwolf at gmail.com> wrote:
> I'm trying to figure out the easiest/best way to create a static tile
> cache (prerendered) of a map layout created in ArcGIS to be accessed
> using OpenLayers.
I don't know if this the "best" way but at first glance I would
probably write an arc server plugin for tilecache (to do the seed) and
use arc server's rest api to grab the images. From looking at the
mapnik layer plugin it seems pretty straightforward.
>From there you could use openlayers' tilecache layer to read the
tilecache structure and make it super fast.
> Here's the background: The current USGS real time earthquake website
> uses pre-rendered maps using circa 1995 technology. These maps get
> rendered as static graphic files on a system at the Survey and then
> copied to servers at Akamai. This works well because immediately
> following any decent quake, traffic to this site jumps to
> hundreds-of-thousands of hits per second.
> The basemaps for the rendering code are basically a collection of
> static graphics exported from ArcGIS. The basemap symbology has been
> carefully constructed for this purpose by real cartographers.
> I'm trying to figure out the best way to assemble a more dynamic
> website - but a typical ArcServer->Web Browser or
> GeoServer->OpenLayers system won't be able to scale to the kind of
> traffic seen immediately following a quake. The
> GeoServer->Tilecache->OpenLayers is an obvious step in the direction
> we need to go - but I don't really want to have to replicate the
> ArcGIS symbology in GeoServer (or Mapnik or MapServer).
> So I'm trying to figure out if I use ArcServer to generate a static
> tilecache (i.e., the collection of 256x256 png files), how can I
> access it via OpenLayers?
> One possibility is to try to get the AGS extension to OpenLayers
> working (which seems to be abandoned). Another is to kludge
> TileCache.cgi for the directory structure generated by ArcServer's
> tile cache seeding. And yet another is to try to restructure the tiles
> generated by ArcServer in a way that TileCache.cgi likes.
> Any help is much appreciated.
> Eric B. Wolf 720-209-6818
> USGS Geographer
> Center of Excellence in GIScience
> PhD Student
> CU-Boulder - Geography
> Tilecache mailing list
> Tilecache at openlayers.org
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